arc: Fix race conditon when Play Store is started too early.

chrome/browser/ui/app_list/arc/arc_app_utils.h

Index: chrome/browser/ui/app_list/arc/arc_app_utils.h
diff --git a/chrome/browser/ui/app_list/arc/arc_app_utils.h b/chrome/browser/ui/app_list/arc/arc_app_utils.h
index e0911730bbfed73048e44dbf63badcb64068755f..8c75cb96059bc7abadd6c0dc13d58df687a8d695 100644
--- a/chrome/browser/ui/app_list/arc/arc_app_utils.h
+++ b/chrome/browser/ui/app_list/arc/arc_app_utils.h
@@ -43,6 +43,8 @@ bool LaunchPlayStoreWithUrl(const std::string& url);
 
 // Launch an app with given layout and let the system decides how big and where
 // to place it.
+// TODO (khmel) replace bool for |landscape_layout| with enum class in order
+// to prevent using another LaunchApp with different signature mistakenly.
 bool LaunchApp(content::BrowserContext* context,
                const std::string& app_id,
                bool landscape_layout,